This service is responsible for calculating shipping costs, based on the number of items to be shipped. The quote service is called from Shipping Service via HTTP.
The Quote Service is implemented using the Slim framework and php-di for managing the Dependency Injection.
The PHP instrumentation may vary when using a different framework.
In this demo, the OpenTelemetry SDK has been automatically created as part of SDK autoloading, which happens as part of composer autoloading.
This is enabled by setting the environment variable
require __DIR__ . '/../vendor/autoload.php';
There are multiple ways to create or obtain a
Tracer, in this example we
obtain one from the global tracer provider which was initialized above, as part
of SDK autoloading:
$tracer = Globals::tracerProvider()->getTracer('manual-instrumentation');
Manually creating spans
Creating a span manually can be done via a
Tracer. The span will be default be
a child of the active span in the current execution context:
$span = Globals::tracerProvider() ->getTracer('manual-instrumentation') ->spanBuilder('calculate-quote') ->setSpanKind(SpanKind::KIND_INTERNAL) ->startSpan(); /* calculate quote */ $span->end();
Add span attributes
You can obtain the current span using
$span = Span::getCurrent();
Adding attributes to a span is accomplished using
setAttribute on the span
object. In the
calculateQuote function 2 attributes are added to the
$childSpan->setAttribute('app.quote.items.count', $numberOfItems); $childSpan->setAttribute('app.quote.cost.total', $quote);
Add span events
Adding span events is accomplished using
addEvent on the span object. In the
getquote route span events are added. Some events have additional attributes,
others do not.
Adding a span event without attributes:
$span->addEvent('Received get quote request, processing it');
Adding a span event with additional attributes:
$span->addEvent('Quote processed, response sent back', [ 'app.quote.cost.total' => $payload ]);